ESR Spectroscopy mcq M.Sc. II Organic Chemistry

Resonance February 03, 2022

M. Sc. Second year Postgraduate degree course

Third Semester

CHE - 313 Structural Elucidation by Spectral methods

Electron Spin Resonance Spectroscopy: Introduction, principle of ESR spectroscopy, presentation of spectrum. Hyperfine splitting in various structures. Hyperfine splitting diagram of representative examples, factors affecting the magnitude of 'g' values, Zero field splitting, Kramer's degeneracy, Anisotropy in the hyperfine coupling constant, electron delocalization, instrumentation and applications.

1. Electron spin resonance involves detecting the detection of a physical phenomenon of ________ of electromagnetic radiation.

(A) Adsorption
(B) Absorption
(C) Radiation
(D) Reflection

2. Electron spin resonance is also known as which of the following?

(A) Electron paramagnetic resonance
(B) Electron diamagnetic resonance
(C) Electron paramagnetic reoccurrence
(D) Electron diamagnetic reoccurrence

3.Which of the following will NOT show electron spin resonance (ESR)?

(A) Free radicals

(B) Paramagnetic materials

(C) Transition metals

(D) Diamagnetic materials

4.Which of the following electromagnetic radiation is used in ESR?

(A) IR radiation

(B) Radio waves

(C) X-radiation

(D) Microwaves

5.For an unbound electron, value of Lande’ factor (g-factor) will be equal to

(A) 1.0098

(B) 2.0023

(C) 3.0015

(D) 6.0621

6.Hyperfine splitting in ESR is observed due to surrounding

(A) Paired electrons

(B) unpaired electrons

(C) Nuclei with I=1/2

(D) All of these

7.An adjacent atom of ¹⁵N can split the spectral lines of electron in to

(A) 2

(B) 3

(C) 4

(D) 5

8.Unit for measurement of hyperfine splitting constant in ESR is

(A) Guass

(B) Tesla/sec

(C) Guass/mm

(D) No units

9.Hyperfine splitting that can be observed with two equivalent protons will be

(A) 2

(B) 3

(C) 5

(D) 6

10.Primary standard used in ESR is

(A) 1,1-diphenyl-2’-picrylhydrazyl

(B) Nitrosobenzene

(C) Tetramethyl silane

(D) Diphenyl hydrazyl

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